Identification of ethylene-derived species on Al sub 2 O sub 3 -supported Rh, Ir, Pd, and Pt catalysts by infrared spectroscopy

Journal Article · Thu Aug 22 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100170a051· OSTI ID:7163484

Mohsin, S B; Trenary, M ^[1]; Robota, H J ^[2]

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1. Univ. of Illinois, Chicago (United States)
2. Allied-Signal Engineered Materials Research Center, Des Plaines, IL (United States)

The authors have used infrared spectroscopy to study ethylene adsorption of alumina-supported Rh, Ir, Pd, and Pt at and below room temperature. The adsorption of ethylene at room temperature gives a set of infrared bands indicating the presence of both {pi}-bonded ethylene and ethylidyne on the surface of each metal. At lower temperatures di-{sigma}-bonded ethylene is formed which converts to ethylidyne as the temperature is raised. The C-C stretch and the CH{sub 2} scissors mode of {pi}-bonded ethylene have been used as a measure of the bond strength between the molecule and the metal surface. The bond strength follows the sequence Rh > Pd, Ir > Pt. They have attempted to explain the difference in the bond strengths among these metals by using simple qualitative arguments.

• OSTI ID: 7163484
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:17; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BINDING ENERGY
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
DATA
ELEMENTS
ENERGY
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
IRIDIUM
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
RHODIUM
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS